Thanks for your comment and we will look to update the content to reflect the rise of STOs in more recent times.
To your question, for Initial Coin Offerings ("ICOs"), you do not have control or a right to a share of the token which means tokens that provide utility and give no claims and rights (similar to Kickstarter products that are asking for support).
For Securitised Token Offerings ("STOs"), the offering is backed by something tangible like assets, profits, or revenue of a company. When an STO happens, you are selling some form or right or potential control of the company.
Hope that answers your question - do let me know if you have further queries.

Thanks for your question. A simple way to think about it is:
Public and private relates to the blockchain architecture based on ownership of the data infrastructure
Permissionless and permissioned relates to architecture based on read and write permissions granted to the participants
The common combination is public permissionless which is the most open form of blockchain where anyone can join, read and write and data is hosted publicly. This is where most cryptocurrency projects focus on.
The other end of the spectrum is private permissioned where only authorised participants can join and read. This is where most enterprise blockchain established by corporates focus on.

Lesson 2.6 https://www.hashcademy.com/en/courses/blockchain-for-beginners-build-certificate-registration-dapp/learn/2-6-deploy-your-contract-on-ropsten-testnet
Source: https://github.com/hashcademy/certificate_dapp/tree/5
when I deploy on the Internet, these rectangles appear
(https://www.dropbox.com/s/1yqwk6x2iorzjp8/fig.png?dl=0)
how can I solve this problem in Chrome?
I don't have this problem with Firefox
thank you so much!
Agostino